Key points from this section:

• Explanation of 1 Corinthians 7:14: Section 74 provides an explanation of 1 Corinthians 7:14, which had been used to justify infant baptism. The revelation clarifies that little children are holy and sanctified through the Atonement of Jesus Christ.
• Counsel on Marriage: The section includes counsel from Paul to the early Church, advising against keeping the law of Moses and emphasizing that believers should not be united with unbelievers to avoid conflicts over religious practices.
• Sanctification of Children: It highlights that children are considered holy through the faith of their believing parents, countering the belief that children are unclean without circumcision."

Read this chapter for free at https://byustudies.byu.edu/online-book/doctrine-and-covenants-contexts/section-74.